KROHNE PTD 500 EN - Manual (Page 9)

Installation and Operating Instructions PTD 500 9
4 Product description
4.1 Applications
The pressure sensor with flush-front stainless steel diaphragm and piezoresistive measuring
principle is suitable for pressure and hydrostatic pressure level measurement demanding high
standards in terms of hygiene and accuracy. The sensor is distinguished by a extremely good
long-time stability, a very small temperature drift and good overload withstand capability.
4.2 Functional principle
The piezo-resistive silicon sensor is anodic bonded on a very stable glass base, which is attached
to a stainless steel construction. This assembly guaranties an excellent thermal isolation.
The sensor is located from the process by a stainless steel diaphragm (1.4404/316 L) and a filling
liquid.
4.3 Construction
The weld able process sleeve, made of stainless steel, ensures installation in keeping with
hygiene requirements. The electronic evaluator is fully integrated into the stainless steel housing.
The connection head allows convenient and reliable electrical connection.
The device supplies a 4...20-mA signal in 2-wire connection technology (current sink).
4.4 Features
• Compact design, of stainless steel
• Integrated electronic unit with 4...20-mA current sink
• flush-front stainless steel diaphragm and piezoresistive measuring principle
• High overload withstand capability
• Optimum corrosion and abrasion resistance
• With CIP and SIP capability
• Defined position of the cable gland
• Hygienic adapter sleeves for other process connections